Conduit for electric wires.



Hl N. SPEER. l CONDUI'T POR ELEGTRIG WIRES.

APPLIUATION FILED JULY 12i 1907.

928,285. Patented Julv 20. 1909.

noimoE'N. srnnn, or New YORK, N. Y.

CONDUIT FOR-ELECTRIC WIRES.'

No. ceases.

Specification of Letters Patent.

Patented July ao, ieee.

Application filed July 12, 1907. Serial No, 383,448.

To all whom it may concern:

Be it known that I, HORACE N. Srnnn, a citizen of thc' United States of America, and a resident of the borough of Manhattan, in the city, county, and State of New York,

have invented certain new and useful Imconsists in a' conduit which embodies the novel features and arrangements of parts to be hereinafter describedand claimed.

In the accompanying drawings, Figure 1 is a perspective View of a section of conduit made in accordance with the invention, with parts broken away to show the different layers or coverings, Fig. 2 is a transverse section, Fig. 3 is a perspective view of an uncompleted inner tube, and Fig. L1 is a transverse section of Fig. 3.

The improved flexible conduit consists es sentially of three layers or plies: an inner tube 1, a winding 2 for said tube, and a fabric covering 3. The inner tube 1 can be made of some suitable flexible material, suoli as a textile fabric, paper or similar material, but I preferably construct it of oil-cloth, having a glazed inner4 surface. I have found by experiment that the use of oil-cloth gives superior results, and the glazing of its inner surface is of advantage because the electric wire canV then be very readily threaded through the tube without catching or being obstructed therein. This glaze is` given to the oil-cloth in the course of its manufacture. I also prefer to form the inner tube 1 in the manner showm Said tube is made in two plies by folding a blank 9 longitudinally and then sewing4 together the halves or sections thus formed along their longitudinal centerlines, as shown at 10 in Figs. 3 and 4L. When this has been done the portion adjacent the fold is formed by a mandrel or otherwise into a tube 11, as shown best in Fig. 4. The free portions of the sections or halves of the blank form flaps 12 which extend from the tube 11. The outer surface of the tube l1, or

Asuch as tar.

the outer surfaces of the flaps 1:2, or both, are then coated with a suitable adhesive, such as india-rubber cement, and the flaps folded back and cemented to the tube"as shown in F 1 and 2, whereby the two-ply tube 1 is formed. The edges of the blank meet in the outer ply opposite the stitching 10, as shown.

After the inner tube has been formed in the manner indicated, it is coated thoroughly on the exterior with a moisturerepellent While this tar is stilllmoist, the winding Q is applied to the tube so as to adhere firmly thereto. Said winding Iconsists of a tape or strip of some suitable hard, tough paper, preferably impregnated with a substance which renders it water-proof; and this strip is wound spirally and tightly about the inner tube, as shown in Fig.'y 1, so that the winding thus formed has ,a perfectly smooth outer surface without breaks or une? dulations. After the paper striphasfbeen applied to the inner tube, the tube .thus

formed is covered with the fabric 3, constituting ,the outer covering. Said.'fabrid is in practice-braided about the tube by a'silitable braiding machine. After this operation lso has been completed the fabric covering, lilref4 l the inner tube, is coated thoroughly withtar or other moistu1;'e-repellant. The conduitthus made is extremely strong and. durable, owing to the nature of its layers, and is effectively rendered water proof. It may be lreadily and cheaply manufactured, this being done by suitable machinery.

l Having thus described my invention, I c aim:

1. In a conduit for electric wires, an inner i tube formed by folding a blank longitudinally and stitching the sections thus formed along their longitudinal center-lines to form a tube adjacent the fold, the flaps thus formed being folded back on andremented to such tube. y

2.111 a conduit for electric wires, a twoply inner tube made of one piece of material folded into two sections nach of which is .se-- cured intermediately to thc other and folded on itself.

'3. In a conduit for electric wires, a two ply inner tube made of one piece of material folded longitudinally into two sections, each of which is secured to the other and folded back on itself, so that the edges of the blank are in the Aouter, ply. n l

4. In` aconduit for'electrlc-wires, a twof lilo ply lnner tube made of ablank flded longf Signed at New Yerk city, this 11th day tudnally into `two sections each of which is secured to the other ntermediately by longitudnally extending stitching and .folded back on and cemented to itself, ther edges of the blank being in the outer' ply and meeting opposite said stitching.

of July, I1907.

HORACE N. SPEER-- Witnesses RICHARD CONDON, C. B. SCHROEDER. 

